Equals Method
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Nullable(Of T).Equals Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates whether the current Nullable(Of T) object is equal to a specified object.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Overrides Function Equals ( _
	other As Object _
) As Boolean

Parameters

other
Type: System.Object
An object.

Return Value

Type: System.Boolean
true if the other parameter is equal to the current Nullable(Of T) object; otherwise, false.
This table describes how equality is defined for the compared values:

Return Value

Description

true

The HasValue property is false, and the other parameter is Nothing. That is, two null values are equal by definition.

-or-

The HasValue property is true, and the value returned by the Value property is equal to the other parameter.

false

The HasValue property for the current Nullable(Of T) structure is true, and the other parameter is Nothing.

-or-

The HasValue property for the current Nullable(Of T) structure is false, and the other parameter is not Nothing.

-or-

The HasValue property for the current Nullable(Of T) structure is true, and the value returned by the Value property is not equal to the other parameter.

If the HasValue property of the current Nullable(Of T) structure is true, equality is determined by passing the other parameter to the Equals method of the underlying value of the current Nullable(Of T) structure.

The following code example determines whether an object and a Nullable(Of T) object are equal to the current Nullable(Of T) object.


' This code example demonstrates the Nullable(Of T).Equals 
' methods.


Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim nullInt1 As Nullable(Of Integer) = 100
      Dim nullInt2 As Nullable(Of Integer) = 200
      Dim myObj As Object

      ' Determine if two nullable of System.Int32 values are equal. 
      ' The nullable objects have different values.
      outputBlock.Text &= "1) nullInt1 and nullInt2 "
      If nullInt1.Equals(nullInt2) Then
         outputBlock.Text &= "are"
      Else
         outputBlock.Text &= "are not"
      End If
      outputBlock.Text &= " equal." & vbCrLf

      ' Determine if a nullable of System.Int32 and an object 
      ' are equal. The object contains the boxed value of the
      ' nullable object.
      myObj = CType(nullInt1, Object)
      outputBlock.Text &= "2) nullInt1 and myObj "
      If nullInt1.Equals(myObj) Then
         outputBlock.Text &= "are"
      Else
         outputBlock.Text &= "are not"
      End If
      outputBlock.Text &= " equal." & vbCrLf
   End Sub 'Main 
End Class 'Sample

'
'This code example produces the following results:
'
'1) nullInt1 and nullInt2 are not equal.
'2) nullInt1 and myObj are equal.
'


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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